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Note 17 - Segment Reporting - Segment Revenue by Customer (Details) - Federal Government [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Revenues | $ 27,354,000 | $ 36,105,000
Treatment [Member] |  |
Revenues | 21,434,000 | 30,130,000
Services [Member] |  |
Revenues | $ 5,920,000 | $ 5,975,000

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_MajorCustomersAxis=pesi_FederalGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pesi_TreatmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pesi_ServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |